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Date: Sat, 16 Feb 2013 09:25:12 +0100
From: Ingo Molnar <mingo@kernel.org>
To: Yinghai Lu <yinghai@kernel.org>, Greg KH <gregkh@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Laura Abbott <lauraa@codeaurora.org>, Mel Gorman <mgorman@suse.de>
Subject: Re: [-rc7 regression] Buggy commit: "mm: use aligned zone start for
 pfn_to_bitidx calculation"
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* Ingo Molnar <mingo@kernel.org> wrote:

> Revert attached below - it reverts cleanly and I'll test this 
> today, to see whether this solves the sporadic lockups.

Ok, the revert survived a day of hundreds of randconfigs - while 
it would lock up within 100 randconfigs before.

So this commit appears to be the root cause of the regression.

Thanks,

	Ingo